1992 Honda Civic car revs dip lower then normail when in id

This problem just happened recently. I was at a red light and my revs are normally at 1000 when I am idling but the revs fell to 300 and back to 1000 with a jerking motion, this repeated itself about 4 times in 5 seconds. It stopped. It was then a green light and so I accelerated normally and then when I got to another red light about 15 seconds later, while I was again idling I put the car into neutral and back into drive, this time however the revs fell to 400-500 and the car just kind of vibrated or shook constantly until I resumed moving again. Before this incident happened and I first started the car, it would not start on the first try. All the lights and everything would turn on but the engine would not start. I tried to start it one more time and got the same result. On the third try it started normally. Could these things be connected?